#include<stdio.h>
#include<string.h>
#define NDEBUG
#include <assert.h>
size_t my_strlen(const char *arr)
{
	int i = 0;
	size_t count = 0;	

	assert(arr != NULL);
	while (*arr != '\0')
	{
		count++;
		arr++;
	}
	return count;
}
int main()
{
	char arr[10] = "abcdefghi";
	int sz1 = strlen(arr);
	printf("%d\n", sz1);
	int sz2 = my_strlen(arr);
	printf("%d", sz2);
}